Cobra,

GREAT IDEA. Depending on the pressures used, should be able to get lots of flights with one fill. Pressure will control rate of flow and volume. Can't remember the formulas, but you can fit a whole room of air into a scuba tank when you pressurise it to 3000 psi. I think goldberg used to make some pinch valves made for snake valves that worked pretty good. Going to have to think about this. many of the retract system on larger scale planes used to use 2 liter pop bottles until they exploded. But at lower pressures, maybe the clear bottles would work good and be light too. Basically use a retract storage system and fill connections may work.

Mark